Jump attack help!, Mario fangame Options

[Mariolunatic]

I really need help in my game. It's a Mario fangame. I made a weapon called jump shoes and that makes your attack jump not hammer or anything. That works, but when you attack, it does damage to the enemy straight away! I need it to do damage when Mario or Luigi lands on the enemy. Also there is a super jump skill, you jump on the enemy then bounce onto it again. I don't know how to do damage 2 or more times in the same skill. Help would be much appreciated. Thanks in advance.